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PanelResizeHandle.ts
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PanelResizeHandle.ts
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import useUniqueId from "./hooks/useUniqueId";
import {
createElement,
CSSProperties,
HTMLAttributes,
PropsWithChildren,
ReactElement,
useContext,
useEffect,
useRef,
useState,
} from "./vendor/react";
import { useWindowSplitterResizeHandlerBehavior } from "./hooks/useWindowSplitterBehavior";
import {
PanelGroupContext,
ResizeEvent,
ResizeHandler,
} from "./PanelGroupContext";
import {
PointerHitAreaMargins,
registerResizeHandle,
ResizeHandlerAction,
} from "./PanelResizeHandleRegistry";
import { assert } from "./utils/assert";
import useIsomorphicLayoutEffect from "./hooks/useIsomorphicEffect";
export type PanelResizeHandleOnDragging = (isDragging: boolean) => void;
export type ResizeHandlerState = "drag" | "hover" | "inactive";
export type PanelResizeHandleProps = Omit<
HTMLAttributes<keyof HTMLElementTagNameMap>,
"id"
> &
PropsWithChildren<{
className?: string;
disabled?: boolean;
hitAreaMargins?: PointerHitAreaMargins;
id?: string | null;
onDragging?: PanelResizeHandleOnDragging;
style?: CSSProperties;
tabIndex?: number;
tagName?: keyof HTMLElementTagNameMap;
}>;
export function PanelResizeHandle({
children = null,
className: classNameFromProps = "",
disabled = false,
hitAreaMargins,
id: idFromProps,
onDragging,
style: styleFromProps = {},
tabIndex = 0,
tagName: Type = "div",
...rest
}: PanelResizeHandleProps): ReactElement {
const elementRef = useRef<HTMLElement>(null);
// Use a ref to guard against users passing inline props
const callbacksRef = useRef<{
onDragging: PanelResizeHandleOnDragging | undefined;
}>({ onDragging });
useEffect(() => {
callbacksRef.current.onDragging = onDragging;
});
const panelGroupContext = useContext(PanelGroupContext);
if (panelGroupContext === null) {
throw Error(
`PanelResizeHandle components must be rendered within a PanelGroup container`
);
}
const {
direction,
groupId,
registerResizeHandle: registerResizeHandleWithParentGroup,
startDragging,
stopDragging,
panelGroupElement,
} = panelGroupContext;
const resizeHandleId = useUniqueId(idFromProps);
const [state, setState] = useState<ResizeHandlerState>("inactive");
const [isFocused, setIsFocused] = useState(false);
const [resizeHandler, setResizeHandler] = useState<ResizeHandler | null>(
null
);
const committedValuesRef = useRef<{
state: ResizeHandlerState;
}>({
state,
});
useIsomorphicLayoutEffect(() => {
committedValuesRef.current.state = state;
});
useEffect(() => {
if (disabled) {
setResizeHandler(null);
} else {
const resizeHandler = registerResizeHandleWithParentGroup(resizeHandleId);
setResizeHandler(() => resizeHandler);
}
}, [disabled, resizeHandleId, registerResizeHandleWithParentGroup]);
useEffect(() => {
if (disabled || resizeHandler == null) {
return;
}
const element = elementRef.current;
assert(element, "Element ref not attached");
const setResizeHandlerState = (
action: ResizeHandlerAction,
isActive: boolean,
event: ResizeEvent
) => {
if (isActive) {
switch (action) {
case "down": {
setState("drag");
startDragging(resizeHandleId, event);
const { onDragging } = callbacksRef.current;
if (onDragging) {
onDragging(true);
}
break;
}
case "move": {
const { state } = committedValuesRef.current;
if (state !== "drag") {
setState("hover");
}
resizeHandler(event);
break;
}
case "up": {
setState("hover");
stopDragging();
const { onDragging } = callbacksRef.current;
if (onDragging) {
onDragging(false);
}
break;
}
}
} else {
setState("inactive");
}
};
return registerResizeHandle(
resizeHandleId,
element,
direction,
{
// Coarse inputs (e.g. finger/touch)
coarse: hitAreaMargins?.coarse ?? 15,
// Fine inputs (e.g. mouse)
fine: hitAreaMargins?.fine ?? 5,
},
setResizeHandlerState
);
}, [
direction,
disabled,
hitAreaMargins,
registerResizeHandleWithParentGroup,
resizeHandleId,
resizeHandler,
startDragging,
stopDragging,
]);
useWindowSplitterResizeHandlerBehavior({
disabled,
handleId: resizeHandleId,
resizeHandler,
panelGroupElement,
});
const style: CSSProperties = {
touchAction: "none",
userSelect: "none",
};
return createElement(Type, {
...rest,
children,
className: classNameFromProps,
id: idFromProps,
onBlur: () => setIsFocused(false),
onFocus: () => setIsFocused(true),
ref: elementRef,
role: "separator",
style: {
...style,
...styleFromProps,
},
tabIndex,
// CSS selectors
"data-panel-group-direction": direction,
"data-panel-group-id": groupId,
"data-resize-handle": "",
"data-resize-handle-active":
state === "drag" ? "pointer" : isFocused ? "keyboard" : undefined,
"data-resize-handle-state": state,
"data-panel-resize-handle-enabled": !disabled,
"data-panel-resize-handle-id": resizeHandleId,
});
}
PanelResizeHandle.displayName = "PanelResizeHandle";